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AUSCERT External Security Bulletin Redistribution
ESB-2001.429 -- Foundstone Advisory FS-101501-20-GWSE
Novell Groupwise arbitrary file retrieval vulnerability
17 October 2001
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AusCERT Security Bulletin Summary
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Product: Novell GroupWise 5.5
Novell GroupWise 6
Vendor: Novell
Operating System: Windows 2000
Impact: Access Privileged Data
Access Required: Remote
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FS Advisory ID: FS-101501-20-GWSE
Release Date: October 15, 2001
Product: Novell GroupWise
Vendor: Novell (http://www.novell.com)
Vendor Advisory: See vendor website.
Type: Arbitrary file retrieval vulnerability
Severity: High
Author: Mike Shema (mike.shema@foundstone.com)
Foundstone, Inc. (http://www.foundstone.com)
Operating Systems: Windows 2000
Vulnerable versions: GroupWise 5.5, 6
Foundstone Advisory:
http://www.foundstone.com/cgi-bin/display.cgi?Content_ID=327
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Description
A vulnerability exists with Novell's GroupWise server which
allows for the arbitrary viewing of files anywhere on the
system. This includes files outside of the web root, but on
the same volume as the web server.
Details
The Novell GroupWise server has a web-based front-end for
users to access e-mail and other functions of the server. The
default login page is accessed by the URL:
/servlet/webacc
The webacc usually accesses templates from the "/" directory;
however, the servlet will follow directory path traversal.
It is possible to view the full path of the server install by
passing an invalid argument to the User.html variable:
/servlet/webacc?User.html=noexist
which will display the full path of the GroupWise install.
Arbitrary files can be read by the webacc servlet by passing
the appropriate file name and appending a null character to
the string:
/servlet/webacc?User.html=../../../../../../../../boot.ini%00
Administrators should note that the Groupwise configuration
files can be viewed with this exploit. Care should be taken
to limit the amount of sensitive data within these files.
Proof of concept
From a browser, make the following URL request:
http://server:port/servlet/webacc?User.html=../../../../../../
../../boot.ini%00
Solution
Please contact the vendor for a solution. Customers should
obtain upgraded software by contacting their customer support
representative to obtain patches.
The severity of this vulnerability and vulnerabilities of a
similar nature can be significantly reduced by installing the
GroupWise server (or other application) files on a disk volume
separate from the windows system root.
Credits
We would also like to thank Novell for their reaction
to this problem and their co-operation in heightening security
awareness in the security community.
Disclaimer
The information contained in this advisory is the copyright
(C) 2001 of Foundstone, Inc. and believed to be accurate at
the time of printing, but no representation or warranty is
given, express or implied, as to its accuracy or
completeness. Neither the author nor the publisher accepts
any liability whatsoever for any direct, indirect or
conquential loss or damage arising in any way from any use
of, or reliance placed on, this information for any purpose.
This advisory may be redistributed provided that no fee is
assigned and that the advisory is not modified in any way.
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